where is the conflict?

This PC is XP Pro with Office XP (all OS and Office updates installed). After installing Norton Corporate Edition Anti Virus the following started… While in Word program and accessing docs through a mapped drive on the server,the program hangs and hangs, eventually causeing client to end task in order to get out. This occurs when opening, closeing and useing the save as option. I’ve un-installed Corporate Edition and cleaned the registry. Installed Norton 2003 and the same thing happens. When theres no Norton, everything works great! I even uninstalled and reinstalled the whole office suite. Im getting ready to do a complete re-install of everything. Help!